Fix: 저장 버튼 활성화 및 저장 완료 후 프로필 페이지로 이동 #252

[sjkymy]

• 게시글 입력되면 버튼 활성화
• 게시글 없이 저장 버튼 클릭하면 alert
• 게시글 업로드 완료 후 본인 프로필 페이지로 이동

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